#!/bin/bash
# using dialog to create a menu

temp=$(mktemp -t test.XXXXXX)
temp2=$(mktemp -t test2.XXXXXX)

function diskspace {
   df -k > $temp
   dialog --textbox $temp 20 60
}

function whoseon {
   who > $temp
   dialog --textbox $temp 20 50
}

function memusage {
   cat /proc/meminfo > $temp
   dialog --textbox $temp 20 50
}

while [ 1 ]
do
dialog --menu "Sys Admin Menu" 20 30 10 1 "Display disk space" 2
    "Display users" 3 "Display memory usage" 0 "Exit" 2> $temp2
if [ $? -eq 1 ]
then
   break
fi

selection=$(cat $temp2)

case $selection in
1)
   diskspace ;;
2)
   whoseon ;;
3)
   memusage ;;
0)
   break ;;
*)
   dialog --msgbox "Sorry, invalid selection" 10 30
esac
done
rm -f $temp 2> /dev/null
rm -f $temp2 2> /dev/null
